????????? ???????????

???????????????????,???????????,?????????,????????????

??????????2????,?????????????,???????????????????????,2??????????

????????????????,????,??????,???????????????,??????,?????????????

??????????????,????14~15???????,?????????????,????????????????????????????????,18~20??,?????????????????,???????

??????????????????,??????????????????????????????????????????,????????

????,?????????

???????????,??????????????,???????15~16??????????????

????????,????????????????????15??,????15°C,????5~8?,????

??????????,??17????????????????16?,???????,???????7~8????????

?????????????????,15??????,??,????????????????????????16?????????,??,???????????????????15???,???????????20????

????,?????4????????10°C????????????,16???????17°C;?15???26???,???10???????????,?????

??????15??,????????????,??

???????????,??????:????

????????????,?????,???????????????,??????????;??????,?????????????,???????????

????????,?????????,??,????????,????????????,??????,??????????,??